Cool story and concept, but was hoping for more. The animation feels cheap at times. Character development is fairly weak and the emotions of the characters are completely unaligned with how you would imagine people would be if their country is sinking. "Hey, let's all take a selfie!" Or people giggling and chatting light-heartedly 5 minutes after a major earthquake levels entire cities. Even their decision to move to another location at the beginning doesn't make much sense from a survival standpoint. If there was massive flooding, they were already on the highest ground in their city at the Shinto shrine. Why leave in the first place? It leaves us with a rather unbelievable performance. As a side note, the English dubbing is pretty terrible too.